Workforce / workplace programs, Copenhagen, Denmark (confidential; self/partner-administered with coached guidance)
Trunk-extensor endurance (Biering-Sørensen) + McGill torso-balance ratio screen — Copenhagen, Denmark.
HONESTY LIMIT stated directly: this standard's own foundational 1984 citation's own PubMed record (NCBI eutils, PMID 6233709) lists no institutional affiliation for Read all of it
Not funded yet. Settles as earned credit, $220 proposed.
Proof it takes, the deadline, the level
- Proofpre-test back-pain/red-flag screen (cleared, or routed and the test not performed) + Biering-Sørensen extensor hold time + McGill flexor and left/right side-bridge hold times + computed flexor:extensor and side-bridge:extensor ratios and left:right symmetry, with any red flag, pain-triggered stop, or high-risk ratio pattern routed to a clinician or physical therapist and a ratio-targeted training plan recorded for those cleared
- Open until2027-01-07
- Levelintermediate
All of it: the words, the place, the proof
HONESTY LIMIT stated directly: this standard's own foundational 1984 citation's own PubMed record (NCBI eutils, PMID 6233709) lists no institutional affiliation for first author F. Biering-Sørensen (a pre-affiliation-era record), so this session confirmed via a much more recent PubMed record (PMID 38600074, 2024) that F. Biering-Sørensen is currently affiliated with the Department for Brain- and Spinal Cord Injuries, Rigshospitalet, and the Department for Clinical Medicine, University of Copenhagen, Copenhagen, Denmark -- his current, not historical, institution, the same sole author whose own 1984 endurance-hold test this standard directly administers. Distinct from the existing national (generic telehealth framing), Los Angeles (that city's own construction/trades workforce loading pattern), and Waterloo (McGill's own institution, this standard's second citation's author) tiles -- Copenhagen is this standard's own foundational citation's own sole author's current institution, a fourth distinct category.
Fund it for $220. Proof lands onchain when it's done.
How this work is done
How this work is done
A documented method, so this packet comes out the same whoever does it.
Bring
- a padded table or plinth with the edge at iliac-crest height (or a Biering-Sørensen test bench)
- straps, or an assistant/partner, to fix the pelvis, legs, and ankles to the table
- stopwatch/timer
- a firm mat for the side-bridge and curl-up holds
- a pre-test back-pain / red-flag screening checklist
- a secure note for hold times, computed ratios, and referrals
Steps
- 1. Screen for back pain and red flags FIRST, before any positioning: current low-back pain of any intensity, sciatica or radiating leg pain/numbness, a back injury within the past 6 weeks, unexplained weight loss, fever, saddle numbness, new bowel/bladder change, prior spinal fracture/surgery, or uncontrolled disease -> STOP, do not test, route to a clinician or physical therapist. This is a screen for pain-free people, never a diagnostic tool to push through pain.
- 2. For those cleared: demonstrate all three holds (prone extensor, flexed-knee flexor curl-up, side bridge) before timing anything, and confirm the person can reach each position pain-free.
- 3. Biering-Sørensen extensor hold: position prone with the upper body (from the iliac crest up) unsupported off the table edge, arms crossed over the chest, pelvis/legs/ankles fixed by straps or a spotter; hold the torso horizontal, in line with the legs, and time to failure (loss of the horizontal position) or a 240-second cap. Stop immediately on pain.
- 4. McGill trunk-flexor hold: supine, knees bent ~90 degrees, trunk flexed to ~60 degrees (shoulders off the floor, resting against a wedge or the tester's hands at that angle), arms across the chest; time to failure (loss of the 60-degree position) or a 240-second cap. Stop immediately on pain.
- 5. McGill side-bridge holds, both sides: side-lying on the forearm and feet (top foot ahead of the bottom foot for stability), hips lifted off the floor into a straight line, free arm across the chest; time each side to failure (hips touch down) or a 240-second cap, with full rest between sides. Stop immediately on pain.
- 6. Compute the ratios: flexor:extensor (McGill's normative target is below ~1.0 — an extensor hold notably shorter than the flexor hold is the injury-risk pattern) and each side-bridge:extensor (target below ~0.75), plus the left:right side-bridge ratio (target close to 1.0, symmetric).
- 7. Record all four raw hold times, both ratios, and side-to-side symmetry; compare against McGill's normative bands as a risk-pattern signal, never a diagnosis.
- 8. Coach a ratio-targeted endurance/bracing plan (McGill's 'big three': curl-up, side bridge, bird-dog) sized to the weakest link identified by the ratios, sign, and set a retest cadence.
What counts as done
- Pre-test back-pain/red-flag screen completed and recorded BEFORE any positioning; any positive flag routes to a clinician or physical therapist and the test is not performed
- All four hold times recorded (Biering-Sørensen extensor, McGill flexor curl-up, side-bridge left, side-bridge right) with the stop reason for each
- Flexor:extensor and side-bridge:extensor ratios computed and compared to McGill's normative targets, plus left:right side-bridge symmetry, as a risk-pattern signal, not a diagnosis
- A ratio-targeted McGill 'big three' training plan recorded, sized to the weakest link identified (job-loading pattern noted: lifting, carrying, overhead work), plus a retest date
Proof is measured against these, not judged by taste.
What is promised, and what is not
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